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Re:US Department of Energy: Fusion Ignition Achieved by paxys on Tuesday December 13, 2022 @12:49PM (#33972686)
The input energy X is used to create the conditions of high temperature and pressure that are needed for fusion to take place.

When fusion happens, two hydrogen atoms fuse together into one, losing a bit of mass in the process. The mass difference is converted into energy Y (using E=mc2).

In this case, Y was greater than X, so there was a net gain in useful energy.

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